Malicious PDF — malware analysis report

Static analysis result for SHA-256 81beb9ae4ce7af06…

MALICIOUS

PDF

63.7 KB Created: 2021-05-01 04:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b75fb6cda7f6cf6c348aefb4d3b772d SHA-1: 4c1d440af1adf335779f3fafa3ec4a3b8665ff84 SHA-256: 81beb9ae4ce7af06026d3ee578e9a6780844d7d6c67d91e02d1d40dc32f1f597
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating it's likely part of a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8289

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082800a1638d---sogatozukevotepinule.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c68f2b5b---20783542526.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6e0c5079---wijorerebomexu.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6g8le46001bsud2j0godv1vi71/paxezixezezovit.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dea82ae7---34985685518.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1988c6ca---wexamigegojodupusatonefiw.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160778da070304---27649102142.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/48f9fe8a8116cfbe427546fa05024aac/zavirubulinibo.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847bf7f3371---fodijurakerawug.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5drrbbcvbshb9cf8d1j8cf43kn/27000786937.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd1ac33ca9---52434078320.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078da00ae5d1---banosinagorosopivovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=acdsee+photo+studio+2019
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e296.bin
390103534b89c34756cff0fc214f45f3faa6e4319d36ad6f11b61a80e24a98b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 5292 bytes

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